Side and forward dumping loader with bucket clapping means



Filed Sept. 15,

E. ISAKSEN 3,419,171 SIDE AND FORWARD DUMPING LOADER WITH BUCKET CLAPPING MEANS Sheet 1 of 5 i, I 8 I 2 6 36 32 t"-lfl l l 1 L INVENTOR. Fig 2 ELMER ISAKSEN ATTORNEYS Dec. 31, 1968 ISAKSEN 3,419,171

SIDE AND FORWARD DUMPING LOADER WITH BUCKET CLAPPING MEANS Filed Sept. 15, 1966 Sheet 2 of 5 ELM ER ISAKSEN ATTORNEYS Dec. 31, 1968 Filed Sept. 15, 1966 E. ISAKSEN 3,419,171 SIDE AND FORWARD DUMPING LOADER' WITH BUCKET CLAPPING MEANS Sheet 3 I of 5 as L I/ 204 A l -208 INVENTOR. ELMER ISAKSEN @ZZ WK ATTORNEYS United States Patent M 3,419,171 SIDE AND FORWARD DUMPING LOADER WITH BUCKET CLAPPIN G MEANS Elmer Isaksen, Rte. 1, Cushing, Minn. 56443 Filed Sept. 15, 1966, Ser. No. 579,626 9 Claims. (Cl. 214-768) ABSTRACT OF THE DISCLOSURE The disclosure relates to a side and forward dumping loader including first and second bucket cradle means connected to a boom, a bucket, a first extendable member pivotally connected at one end to the bucket and pivotally connected at the other end to the first bucket cradle means adapted to fold to a position beneath the bucket, a second extendable hinge member pivotally connected at one end to the bucket and pivotally connected at the other end to the second bucket cradle means adapted to fold to a position beneath the bucket, first means for locking the first hinge member in a folded position beneath the bucket together with second means for locking the second hinge member in a folded position beneath the bucket. Also first means for releasing the first hinge locking means together with second means for releasing the second hinge locking means and a single hydraulic means connected to the boom means centrally thereof and said bucket centrally thereof for tilting the bucket on one of said first and second hinge members when the other hinge member is locked.

The invention relates to an improvement in vehicle mounted loaders having a bucket adapted to dump material to either Side of the vehicle as well as forwardly thereof.

It is an object of the invention to provide a loader having a dump bucket with new and novel hinge lock and release means which allows tilting of the bucket to either side of the vehicle with equal facility and which also provides a clapper member for clapping the underside of the bucket dumping position to cause the dumping of the last portions of material, which tend to remain in the bucket.

It will not be here attempted to set forth and indicate all of the various objects and advantages incident to the invention, but other objects and advantages will be referred to in or else will become apparent from that which follows.

The invention will appear more clearly from the following detail description when taken in connection with the accompanying drawings, showing by way of example a preferred embodiment of the inventive idea wherein like numerals refer to like parts throughout.

In the drawings forming part of this application:

FIGURE 1 is a side elevational view of the dumping loader with the bucket in a raised horizontal position.

FIGURE 2 is a front elevational view thereof with the bucket shown alternatively tilted to both sides in broken lines and a truck to be loaded shown in broken lines alongside the loader.

FIGURE 3 is an enlarged detailed view of the bucket, the supports therefor and the mechanism for tilting and locking the bucket substantially on the line 3-3 of FIG- URE 1, portions of the bucket cradles being shown in section and a hinge member shown in clapping position against the bucket in broken lines.

FIGURE 4 is a front elevational view of the bucket, the supports therefor and the mechanism for tilting and locking the bucket.

FIGURE 5 is an enlarged detailed view of the lock 3,419,171 Patented Dec. 31, 1968 and release mechanism shown in the locked condition, a portion of which is in section.

FIGURE 6 is a sectional view on the line 66 of FIG- URE 4, the bucket not being shown.

FIGURE 7 is a top plan view of that shown in FIG- URE 5.

FIGURE 8 is a view similar to FIGURE 5 with the mechanism shown in unlocked or released condition.

FIGURE 9 is a sectional view on the line 99 of FIGURE 8.

Referring to the drawings in detail, the loader A includes the spaced primary movable vertical supports 12 and 14 pivotally connected at the lower ends to the bosses 16 and 18, respectively by means of the pins 20 and 22 extending through the clevis formations 24 and 26 formed on the lower ends of the supports 12 and 14, respectively. The bosses 16 and 18 are formed on the vertical standards 28 and 30, respectively, which are mounted on the brackets 32 and 34, which are secured to the sides of the substantially rectangular loader frame 36. Secured to both sides of the upper end of the support 12 are a pair of plates 38 and 40, and secured to both sides of the upper end of the support 14 are a pair of plates 42 and 44, identical to the plates 38 and 40. The numeral 46 designates a boss which is mounted on the bracket 32 and which mounts the clevis member 48 mounted on the lower end of the hydraulic piston rod 50 by means of the pin 52. The piston rod 50 operates by conventional hydraulic pressure in the cylinder 54 mounted thereon. The upper end of the cylinder 54 is pivotally connected to the plates 38 and 40 -by means of the pin 56 extended through a hole in the boss 58 connected to the upper end of the cylinder 54.

The numeral 60 designates a boss which is mounted on the bracket 34 and which mounts the clevis member 62 mounted on the lower end of the hydraulic piston rod 64 by means of the pin 66. The piston rod 64 operates by conventional hydraulic pressure in the cylinder 68 mounted thereon. The upper end of the cylinder 68 is pivotally connected to the plates 42 and 44 by means of the pin 70 extended through a hole in the boss 72 connected to the upper end of the cylinder 68.

Further provided are the pair of arms 74 and 76. The arm 74 is connected at its inner end to the plates 38 and 40, and the arm 76 is connected at its inner end to the plates 42 and 44. Additionally provided is the first bucket cradle 78 which includes the spaced plates 80 and 82 rigidly connected at the front by the brace 84. The upper edges of the cradle plates 80 and 82 are of an arcuate concave form as at 86 adapted to receive the convex outer transverse contour of the bucket B. The cradle plates 80 and 82 are each formed with a recess 88 having the bottom horizontal support edge 90. The cradle 78 is pivotally connected adjacent its forward end of the outer end of the arm 74 by means of the pin 92, and pivotally connected at its outer end to the cradle 78 adjacent its inner end by means of pin 94 is the piston rod 96 mounted in the hydraulic cylinder 98. The inner end of the cylinder 98 is pivotally connected to the plates 38 and 40 by means of the pin 100.

Further provided is the second bucket cradle member 101 which includes the spaced plates 102 and 104 rigidly connected at the front by the brace 106. The upper edges of the cradle plates 102 and 104 are arcuate concave in form, identical to plates 80 and 82 adapted to receive the convex outer transverse contour of the bucket B when the same is in a horizontal position as in FIG- URES l, 2 and 4. The cradle plates 102 and 104 are each formed with a recess 108 identical to recesses 88 of plates 80 and 82 and having the bottom horizontal support edge 110.

The cradle 101 is pivotally connected adjacent its forward end to the outer end of the arm 76 by means of the pin 112 as in the case of the cradle 78, and pivotally connected at its outer end to the cradle 101 adjacent its inner end by means of a pin identical is a rod and pin (not shown) but identical to rod 96 and pin 94, and the rod is mounted on a cylinder identical to cylinder 98, the cylinder being pivotally connected to plates 42 and 44.

The cylinder 98 and the identical cylinder described but not shown are actuated by conventional hydraulic means and are used to tilt the bucket B forwardly on the pins 92 and 112.

The numeral 114 designates a transverse support secured at one end to the inner cradle plate 82 and at the other end to the inner cradle plate 102. Connected to the transverse support 114 and extending rearwardly therefrom is the extension member 116. The hydraulic cylinder 118 is pivotally connected at its lower end to the extension 116 by means of the pin 120 positioned through a hole formed in the boss 122 connected to the end of the cylinder. The piston rod 124 is mounted in the cylinder 118 and actuated by fluid pressure via the line 126 by means of conventional controls not shown. The outer end of the Piston rod 124 is pivotally connected to the rear wall of the bucket B centrally thereof by means of the pin 128 secured to the bucket B and extending through the hole-equipped connector 130. By actuation of the cylinder 118 the bucket B is tilted as illustrated in FIGURE 3 by means of the mechanism. hereinafter desscribed.

The numeral 132 designates a short leaf hinge portion secured to the support edges 110 of the cradle 101, particularly FIGURE 3. Pivotally connected at the lower end to the lower hinge portion 132 by means of pin 134 is the first upper hinge portion 136. The first upper hinge portion 136 is pivotally connected at its upper end to the lower end of the second upper hinge portion 138 by means of the pin 140. The upper end of the second upper hinge portion 138 is pivotally connected to the upper base hinge portion 142 by means of the pin 144, and the hinge portion 142 is secured to the underside of the bucket B adjacent the end thereof, FIGURE 3 in particular. The hinge portions 138 and 136 provide a first hinge means for the bucket pivotally connected to the bucket on pin 144 and to the cradle 101 on pin 134.

Also provided is the short lower leaf hinge portion 146 secured to the support edges 90 of the cradle 78, particularly FIGURES 3 and 4. Pivotally connected at the lower end to the lower hinge portion 146 by means of the pin 148 is the first upper hinge portion 150. The first upper hinge portion 150 is pivotally connected at its upper end to the lower end of the second upper hinge portion 152 by means of the pin 154. The upper end of the second upper hinge portion 152 is pivotally connected to the upper base hinge portion 154 by means of pin 156, and the hinge portion 154 is secured to the underside of the bucket B adjacent the end thereof, FIGURES 3 and 4 in particular. The hinge portions 150 and 152 provide a second hinge means for the bucket pivotally connected to the bucket on pin 156 and to the cradle 78 on pin 148. The hinge portion 152 is of a greater length than hinge portion 150, and hinge portion 138 is of a greater length than hinge portion 136, thereby placing pivot 156 outboard of pivot 148 and pivot 144 outboard of pivot 134 when in folded position, which allows in either case a rocking and sliding movement as at and from point X, as more fully explained hereinafter. Secured to and extending outwardly from the front edge of the upper hinge portion 138 is the lock rod 158, and secured to and extending outwardly from the front edge of the upper hinge portion 152 is the lock rod 160.

The first of a pair of hinge lock and release mechanisms is indicated as L and the same includes the upright support 162 which is secured centrally of the transverse support 114. A first hydraulic cylinder 164 is connected at one end to the support 162 and overlies the support 114. The cylinder 164 is formed with the inlet-outlet hole 166 to which the hydraulic supply line 168 is connected. The outer end of the cylinder 164 is formed with the plug 170 having the hole 172 through Which the piston rod 174 extends. A piston 176 is secured to the inner end of the rod 174, and positioned on the rod 174 between the piston 176 and the plug 170 is the coil spring 178 normally urging the piston inwardly of the cylinder. Mounted on the outer end of the piston rod 174 is the connector member 180 formed with the bifurcated end 182.

Further provided is the generally U-shaped rocker member 184 including the spaced leg portions 186 and 188 connected by the base portion 190. The leg portion 186 of the rocker 184 is pivotally connected to the bifurcated end 182 of the connector 180 by means of the pin 192. The numeral 194 designates a hook member which includes the main body portion 196 which terminates at its upper end in the right angular portion 198 and at its lower end in the bifurcated portion 200 pivotally connected to the base portion 190 of the rocker member 184 by means of the pin 203. The body portion 196 of the hook 194 has formed on each side thereof the lugs 202 and 204, and the leg portion 188 of the rocker member 184 has formed on each side thereof the lugs 206 and 208 which are in alignment with the lugs 202 and 204. Extending inwardly of the inside edge of the leg 188 and in alignment with the lugs 206 and 208 is the projection 210, and extending from the edge of the main body portion 196 of the hook 194 is the projection 212 in line with the projection 210. Positioned on the projections 210 and 212 is the coil spring 214 which urges the hook 194 against the leg 186 of the rocker 184 and which acts as a shock absorber. The pin 203 extends through the upstanding spaced flanges 216 and 218 secured to the upper surface of the transverse support 114, particularly FIGURE 6.

Secured to the underside of the cylinder 164 is the fiat spring 220, and secured to the outer nd thereof is the upstanding depresser plate 222. The plate 222 has formed therein the primary slot 224 which terminates in the secondary slot 226. In the position of the parts shown in FIGURES 8 and 9 the hydraulic piston rod 174 is in the secondary slot 226 by means of the spring 220 urging the plate 222 upwardly which is accomplished due to the connector 180 moved outwardly to the position of FIGURE 8 by reason of hydraulic pressure in the cylinder by conventional means not shown and the hinge member 152 not in a horizontal position. With the rod 174 in the slot 226 the connector 180 against the plate 222, and the hook 194 is locked in the open position as in FIGURES 8 and 3. The hook 194 is placed in the open locked position of FIGURE 8 from that of FIGURE 5 by exerting fluid pressure in the cylinder 164 thereby forcing connector member 180 away from the cylinder through the slot 224, and the spring 220 causes the plate 222 to move upwardly thereby placing the rod 174 in the secondary slot 226 with the connector 180 urged against the plate 222, all when the hinge member 152 is not all the way down in a horizontal position as in FIGURE 8.

When the hinge portion 152 is placed in a flat horizontal position as in FIGURE 5, the projection 223 extending from the edge of the hinge portion 152 together with hinge portion 152 move down upon the depresser plate 222, thus removing the plate and slot 222 thereof from the rod 174 and allowing the connector 180 to move opposite the opening 224 and pass into the same as shown in FIGURE 5.

The second of a pair of hinge lock and release mechanisms is provided and designated as LL. The lock and release LL is identical to the lock and release mechanism L and the identical parts, except for right and left, are

indicated by the same numeral accompanied by a lower case letter a.

The operation of the device is as follows:

Let it be assumed that the bucket B is the horizontal locked position of FIGURES l, 2 and 4, hydraulic pressure being relieved in the cylinders 164 and 164a by conventional means known in the art, the springs in the cylinders 164 and 164a urging the lock and release mechanisms L and LL into the locked positions as in FIG- URES 2, 4, 5 and 7. Let it further be assumed that it is desired to tilt the bucket B to the position shown in full line in FIGURE 3. To accomplish this, cylinder 164a is pressurized by fluid pressure whereby piston rod 174a is moved outwardly from the cylinder thereby pivoting rocker member 184a on pivot 202:: from the locked po sition of FIGURES 4, 5 and 7 to the unlocked or released position of FIGURES 3 and 8. In this position the hook 194a is disengaged from the lock rod 158 and as a result the cylinder 118 is pressurized causing the piston rod 124 to extend and push or tilt the bucket upwardly to the position of FIGURE 3 upon the pivot pin 156 as the hinge portions 136 and 138 are pulled into a position approaching that of FIGURE 3.

As the bucket B attains the raised position shown in full lines in FIGURE 3 material in the bucket slides from the same. However, if it is necessary to clap the bottom of the bucket, the hook 194 is released in the same manner as hook 194a described above, and the weight of the bucket causes the same to shift downwardly from the full line position of FIGURE 3 to the position shown in broken lines, and this is accomplished by means of the pressure and weight of the bucket B directed in line with pivot pin 156 which is outwardly of pivot 148 thereby creating a lever rocking action at point X. As a result hinge members 156 and 152 which are unlocked pivot together upwardly upon pivots 148 and 156, respectively, the pivot 156 dropping to the position indicated as at Y, FIGURE 3. As the hinge members 150 and 152 pivot upwardly, the same strike or clap the underside of the bucket B substantially at point Z which striking action knocks and frees the last remaining dirt and the like from the outer end of the bottom of the bucket whereby the same slides freely out of the bucket B.

In the open lock position of FIGURE 3 in particular identical to that of FIGURE 8, it Will be seen that the connector member 182a is in engagement with the depresser plate 222a thereby maintaining the hook 194a in the unlocked position of FIGURE 3 while the fluid pressure in cylinder 164a is released. To return the bucket B to the horizontal position of FIGURE 4, fluid pressure is released in the cylinder 118, and as a result the hinge portions 136 and 138 pivot inwardly, the hinge portion 150 rocks on point X while the hinge portion 152 pivots on pivot 156 whereby hinge portions 150 and 152 return with the bucket to the position of FIGURE 4 and the full lines of FIGURE 3.

As the hinge portion 136 strikes the depresser plate 222a, the plate 222a moves downwardly thereby allowing the connector 182a to pass through the opening identical to 224 of plate 222 which causes the hook 194a to engage the lock rod 158. As the hinge portion 150 strikes the depresser plate 222, the hook 194 is actuated in the same manner as hook 194a described which engages and locks lock rod 160.

If the clapping function is not desired, the lock release L, for example, is not released, and the same applies to.

lock release LL.

The invention is not to be understood as restricted to the details set forth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

1. In a loader including a mobile body, forwardly extending boom means pivoted at the inner end thereof to said body, the combination of:

(a) a first bucket cradle means connected to said boom means adjacent the outer end thereof,

(b) a second bucket cradle means connected to said boom means adjacent the outer end thereof,

(c) a material handling dumping bucket,

(d) a first extendable hinge member pivotally connected at one end to said bucket and pivotally con nected at the other end to said first bucket cradle means adapted to fold to a position beneath said bucket, parallel thereto,

(e) a second extendable hinge member pivotally connected at one end to said bucket and pivotally connected at the other end to said second bucket cradle means adapted to fold to a position beneath said bucket parallel thereto,

(f) first means for locking said first hinge member in a folded position beneath said bucket,

(g) second means for locking said second hinge memher in a folded position beneath said bucket,

(h) first means for releasing said first hinge locking means to allow said bucket to tilt in one direction on said second folded hinge member,

(i) second means for releasing said second hinge locking means to allow said bucket to tilt in the opposite direction on said first folded hinge member, and

(j) single hydraulic means connected to said boom means centrally thereof and said bucket centrally thereof for tilting said bucket on one of said first and second hinge member when the other hinge member is locked.

2. The device of claim 1 in which:

(a) said first hinge means includes a lower hinge portion pivotally connected at its lower end to said first cradle means,

(b) an upper hinge portion pivotally connected at its lower end to the upper end of said lower hinge portion and pivotally connected at its upper end to one end of said bucket closely adjacent the outer end thereof,

(c) second second hinge means includes a lower hinge portion pivotally connected at its lower end to said second cradle means, and

(d) an upper hinge portion pivotally connected at its lower end to the upper end of said lower hinge portion and pivotally connected at its upper end to one end of said bucket closely adjacent the outer end thereof.

3. The device of claim 2 in which:

(a) said first hinge locking means includes a first hook mounted on said first bucket cradle means for pivotal movement,

(b) a first extension member connected to and extending from said first hinge member for engagement by said first hook,

(c) means for causing said first hook to engage said first extension member when said first hinge member is folded beneath said first bucket,

((1) said second hinge locking means includes a second hook mounted on said second bucket cradle means for pivotal movement,

(e) a second extension member connected to and extending from said second hinge member for engagement by said second hook, and

(f) means for causing said second book to engage said second extension member when said second hinge member is folded beneath said bucket.

4. The device of claim 3 in which:

(a) said first means for releasing said first hinge looking means includes a first hydraulic actuated rod connected to said first hook for pivoting said hook to disengage the same from said first extension member of said first hinge means,

(b) said second means for releasing said second hinge locking means includes a second hydraulic actuated rod connected to said second hook for pivoting said hook to disengage the same from said second extension member of said second hinge means.

5. The device of claim 1 in which:

(a) said first means for releasing said first hinge locking means includes a first hydraulic actuated rod connected to said first hook for pivoting said hook to disengage the same from said first extension member of said first hinge means,

(b) said second means for releasing said second hinge locking means includes a second hydraulic actuated rod connected to said second hook for pivoting said hook to disengage the same from said second extension member of said second hinge means.

6. The device of claim 3 in which:

(a) said means for causing said first hook to engage said first extension member is a first spring means, and

(b) said means for causing said second book to engage said second extension member is a second spring means.

7. The device of claim 1 in which:

(a) the pivotal connection of said first hinge means to said bucket is offset from the pivotal connection with said first bucket cradle means thereby allowing said first hinge means to rock upwardly upon the pivotal connection with said first cradle means and strike the bottom of the bucket when said first hinge means is released subsequently to the release of said second hinge means, and

(b) the pivotal connection of said second hinge means to said bucket is offset from the pivotal connection with said second bucket cradle means thereby allowing said second hinge means to rock upwardly upon the pivotal connection with said second cradle means and strike the bottom of the bucket when said second hinge means is released subsequently to the release of said first hinge means' 8. In a loader including a mobile body, forwardly extending boom means pivoted at the inner end thereof to said body, the combination of:

(a) a first bucket cardle means connected to said boom means adjacent the outer end thereof,

(b) a second bucket cradle means connected to said boom means adjacent the outer end thereof,

(c) a material handling dumping bucket,

(d) a first extendable hinge member pivotally connected at one end to said bucket and pivotally connected at the other end to said first bucket cradle means adapted to fold to a position beneath said bucket, parallel thereto,

(e) a second extendable hinge member pivotally con nected at one end to said bucket and pivotally connected at the other end to said second bucket cradle means adapted to fold to a position beneath said bucket parallel thereto,

(f) first means for locking said first hinge member in a folded position beneath said bucket,

(g) second means for locking said second hinge member in a folded position beneath said bucket,

(h) first means for releasing said first hinge locking means to allow said bucket to tilt in one direction on said second folded hinge member,

(i) second means for releasing said second hinge locking means to allow said bucket to tilt in the opposite direction on said first folded hinge member,

(j) single hydraulic means connected to said boom means centrally thereof and said bucket centrally thereof for tilting said bucket on one of said first and second hinge members when the other hinge member is locked,

(k) said first hinge means including a lower hinge portion pivotally connected at its lower end to said first cradle means and,

(i) an upper hinge portion pivotally connected at its lower end to the upper end of said lower hinge portion and pivotally connected at its upper end to one end of said bucket,

(m) said second hinge means including a lower hinge portion pivotally connected at its lower end to said second cradle means,

(11) an upper hinge portion pivotally connected at its lower end to the upper end of said lower hinge portion and pivotally connected at its upper end to one end of said bucket,

(0) said upper hinge portion of said first hinge means being of a greater length than said lower hinge portion whereby the pivotal hinge connection with said bucket is positioned transversely outwardly from the pivotal hinge connection of the lower hinge portion with said first cradle means thereby allowing said first hinge means to rock upwardly upon the pivotal connection with said first cradle means and strike the bottom of said bucket when said first hinge means is released subsequently to the release of said second hinge means, and

(p) said upper hinge portion of said second hinge means being of a greater length than said lower hinge portion whereby the pivotal hinge connection with said bucket is positioned transversely outwardly from the pivotal hinge connection of the lower hinge portion with said second cradle means thereby allowing said second hinge means to rock upwardly upon the pivotal connection with said second cradle means and strike the bottom of the bucket when said second hinge means is released subsequently to the release of said first hinge means.

9. ln a loader including a mobile body, forwardly extending boom means pivoted at the inner end thereof to said body, the combination of:

(a) a first bucket cradle means connected to said boom means adjacent the outer end thereof,

(b) a second bucket cradle means connected to said boom means adjacent the outer end therof,

(c) a material handling dumping bucket,

(d) a first extendable hinge member pivotally connected at one end to said bucket and pivotally connected at the other end to said first bucket cradle means adapted to fold to a position beneath said bucket, parallel thereto,

(e) a second extendable hinge member pivotally connected at one end to said bucket and pivotally connected at the other end to said second bucket cradle means adapted to fold to a position beneath said bucket parallel thereto,

(f) first means for locking said first hinge member in a folded position beneath said bucket,

(g) second means for locking said second hinge memher in a folded position beneath said bucket,

(h) first means for releasing said first hinge locking means to allow said bucket to tilt in one direction on said second folded hinge member,

(i) second means for releasing said second hinge locking means to allow said bucket to tilt in the opposite direction on said first folded hinge member,

(j) single hydraulic means connected to said boom means centrally thereof and said bucket centrally thereof for tilting said bucket on one of said first and second hinge members when the other hinge member is locked,

(k) said first hinge means including a lower hinge portion pivotally connected at its lower end to said first cradle means,

(1) an upper hinge portion pivotally connected at its lower end to the upper end of said lower hinge portion and pivotally connected at its upper end to one end of said bucket,

(m) said second hinge means including a lower hinge portion pivotally connected at its lower end to said second cradle means,

(n) an upper hinge portion pivotally connected at its lower end to the upper end of said lower hinge portion and pivotally connected at its upper end to one end of said bucket,

(u) said upper hinge portion of said first hinge means being of a greater length than said lower hinge portion whereby the pivotal hinge connection with said bucket is positioned transversely outwardly from the pivotal hinge connection of the lower hinge portion with said first cradle means thereby allowing said first hinge means to rock upwardly upon the pivotal connection with said first cradle means and strike the bottom of said bucket when said first hinge means is released subsequently to the release of said second hinge means.

References Cited UNITED STATES PATENTS 8/1965 Gardner 214-768 FOREIGN PATENTS 79,480 10/1962 France.

HUGO O. SCHULZ, Primary Examiner. 

